corona proxies longer render times

Corona Corona for 3ds Max Help Required
1

Hi all

I have a scene with lots of corona proxies, which takes 1:41 to parse, but when I convert them back into geometry takes only 20 seconds…why is that?

Thank you

2

By the way, with corona proxies I have 2-3 million polygons, without corona proxies I have, almost 30 million poligons. (trees and plants)

3

Which version of Corona is this?
Are the proxies animated?
Is motion blur enabled?

4

Thank you for your reply
It is Corona 1.5, no animated proxies, no motion blur..is one still image